Chemistry Class 11 Question Answer & Video

Dual Nature

Video For All Chapters Chemistry Class 11

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. A photon has energy of 2.6 eV. What is its wavelength?

2.6 × 10-7 m.

4.8 × 10-7 m.

7.2 × 10-7 m.

6.3 × 10 -7m

Question 1 of 10

2. If uncertainity in the position of an electron is zero, the uncertainity in its momentum would be

Zero

< h / 4π

Infinite

≤ h / 4π

Question 2 of 10

3. Uncertainty in the position of an electron (mass 9.1 x 10^-31 kg) moving with a velocity of 300 ms^-1, accurate upto 0.001% will be:

19.2 x 10^-2 m

3.84 x 10^-2 m

1.92 x 10^-2 m

5.76 x 10^-2 m

Question 3 of 10

4. What experimental result did Albert Einstein cite as evidence that light has particle-like properties?

The fact that electrons posses both particle and wave-like properties.

The orbits of electrons within the hydrogen atom could have only certain radii.

The ejection of electrons from a metal surface by light depends only on the frequency of the light used.

The pattern of light and dark bands produced when light was passed through a pair of narrow slits.

Question 4 of 10

5. The de Broglie wavelength of a particle is given by.

h/mv

h + mv

hmv

mv/c

Question 5 of 10

6. The de - Broglie wavelength of an electron is 600 nm. The velocity of the electron having the mass 9.1 X 10^-31 Kg is

0.0012 x 10⁺⁴ m/s

0.0012 x 10⁺³ m/s

0.0012 x 10⁺⁶ m/s

0.0012 x 10⁺² m/s

Question 6 of 10

7. In the relationship ∆x. ∆p = , ∆p is:

Certainty in momentum

Certainty in position

Uncertainty in momentum

Uncertainty in position

Question 7 of 10

8. The uncertainty principle states that

it is impossible to know anything with certainty

there can only be one uncertain digit in a reported number

it is impossible to know the exact position and momentum of an electron simultaneously

it is impossible to determine mass of light particles

Question 8 of 10

9. Whch of the following will have the maximum value of ∆v . ∆x

Cricket ball

Electron

Table

Tennis ball

Question 9 of 10

10. The de Broglie wavelength of an electron is 8.7 x 10^-11 m. The mass of an electron is 9.1 x 10^-31 kg. The velocity of this electron is:

0.0837 × 10⁸ m/s

6.9 × 10^-5 m/s

8.4 × 10³ m/s

1.2 × 10^-7 m/s

Question 10 of 10

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